This is what i hear, and I would like to proof it.
so why are these things not approved?

I think...........there needs to be a slight modification first in regards to the basket itself. I did hear that this modification would make these baskets pretty close to the exact PDGA standards. For what that's worth.

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Looks like the nubs are aligned with, and completely within, the top ring and are not as aggressive. I would expect more rim slip-outs, i.e., fewer nub grabs. I can't say how that would bear on getting a PDGA approval.